Honestly, I think one thing nailing me down lately is sleep. As soon as I get on track of that, and end up being less tired in the day, I'll be able for more. Body needs adjusting.
Did a 50 minute lesson of math yesterday, I'm enjoying maths more than I have done when I was in school. The test I did the other day, I'd use to crack down and melt from anxiety in attempting tests years ago. But that's becoming less and less of an issue the more I expose myself to questions and tests, the less the punch they have. Still not over the fear fully yet, but doing a lot better. Also mind, I'm pushing myself into this direction too, with no other assistance from anyone else so the climb is going to be harder. But more worth it in the end I hope.
There's books with audio, but I lost my credentials to download them again, so all I have is the book. Also it doesn't come with any workbook, and the online resources for the book cost a lot per month. I'd probably pay for that in the next coming while, once I settle into more of a deeper and more structured routine. Again Irish is the hardest for me to get into, so again, waiting until I'm more prepared to chew into it.
Sorry to hear, energy levels are still hard to get right despite maturing/aging, it's one of those things you can't really ever get right 100% of the time, even up till your 70s. Hope you feel well enough to start again soon.
A good teacher can make a huge difference in your life. I had okay teachers but none of them made me go mad for learning like I am now for languages and such. I think some random person on IRC did that and I don't even know their name anymore.
You get that study high after a good day, it's very worthwhile just for that, lol.